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Proceedings Paper

A hybrid numerical-experimental method for determination of dynamic fracture properties of material
Author(s): S. Mihradi; I. S. Putra; T. Dirgantara; D. Widagdo
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Paper Abstract

A novel hybrid numerical-experimental method to obtain dynamic fracture properties of materials has been developed in the present work. Specimens were tested with one-point bending configuration in the Hopkinson's bar apparatus, from which the impact loading profiles were measured. In this dynamic fracture experiment, the crack tip position was measured by two strips of special strain gage having five gages arranged in one strip. Since the strain gage record only gave strain signal of each gage as a function of time, a novel method is proposed to determine the time at which the crack tip passed each strain gage and the time when the crack finally stopped. From the data of crack tip position as a function of time, the crack speed then can be calculated. These data, i.e. the loading profile and the crack speed, were then used as the input of the Node-Based FEM program developed for dynamic fractures problems. With the proposed method, three dynamic fracture properties of materials i.e dynamic fracture toughness for crack initiation (KIcd), fracture toughness for crack propagation (KID), and crack arrest toughness (KIa) can simultaneously be obtained. The results obtained from the investigation of dynamic fracture properties of Polymethyl Methacrylate (PMMA) material by the present method are well compared with the ones in the literature and from the direct experimental measurement. The good agreement suggests that the hybrid method developed in the present work can be used reliably to determine the dynamic fracture properties of materials.

Paper Details

Date Published: 14 April 2010
PDF: 10 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75224G (14 April 2010); doi: 10.1117/12.851711
Show Author Affiliations
S. Mihradi, Institut Teknologi Bandung (Indonesia)
I. S. Putra, Institut Teknologi Bandung (Indonesia)
T. Dirgantara, Institut Teknologi Bandung (Indonesia)
D. Widagdo, Institut Teknologi Bandung (Indonesia)

Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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